Here is a tumbler tip from @jewelryinstructor - “Older tumbler barrels may get a little smooth on the outside and lose their ability to grip the rollers properly. A couple of wide rubbers bands provide enough traction to keep things rolling along! (Just make sure to put them on so they lie flat!).” Thank you for letting me share this with our community! I have had many a tumbler barrel that didn’t want to rotate and this is a great fix! #tumblertips #tumblingjewelry #jewelrymakingtips